The Kilpi TAIL-U is a functional cap with a few tweaks just for you. We recommend it especially for running, cross-country skiing or other activities associated with higher physical performance. . Lightweight, highly flexible material with OPTI-DRY function helps wick moisture to the surface of the material and dries quickly. The flat seams used do not press and are pleasant to the skin. A bonus is the ponytail opening and reflective elements for your better visibility. . We offer the Kilpi TAIL-U in three sizes for women and men, in several color variants.